package handlers

import (
	"net/http"
	"strconv"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
	"gorm.io/gorm"

	"everypublish/server/internal/api/response"
	"everypublish/server/internal/models"
	"everypublish/server/internal/ws"
	"everypublish/shared/proto"
)

// AccountHandler 账号台账处理器（凭据仅在 Agent 本机保险库，服务器零凭据）
type AccountHandler struct {
	DB  *gorm.DB
	Hub *ws.Hub
}

var platforms = map[string]bool{
	"douyin": true, "kuaishou": true, "xiaohongshu": true, "bilibili": true,
	"shipinhao": true, "x": true, "instagram": true, "whatsapp": true, "youtube": true,
}

type accountReq struct {
	Platform      string `json:"platform" binding:"required"`
	Remark        string `json:"remark"`
	AgentDeviceID uint64 `json:"agentDeviceId"`
	AccountName   string `json:"accountName"`
}

// List 账号台账（筛选 platform/status）
func (h *AccountHandler) List(c *gin.Context) {
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	size, _ := strconv.Atoi(c.DefaultQuery("size", "20"))
	if page < 1 {
		page = 1
	}
	if size < 1 || size > 100 {
		size = 20
	}
	q := h.DB.Model(&models.Account{}).Where("workspace_id = ?", c.GetUint64("wsid"))
	if p := c.Query("platform"); p != "" {
		q = q.Where("platform = ?", p)
	}
	if s := c.Query("status"); s != "" {
		q = q.Where("status = ?", s)
	}
	var total int64
	q.Count(&total)
	var list []models.Account
	q.Order("id desc").Offset((page - 1) * size).Limit(size).Find(&list)
	response.OK(c, gin.H{"list": list, "total": total, "page": page, "size": size})
}

// Create 新增账号（初始 unbound；凭据只登记元数据）
func (h *AccountHandler) Create(c *gin.Context) {
	var req accountReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.Fail(c, http.StatusBadRequest, 1001, "参数不合法")
		return
	}
	if !platforms[req.Platform] {
		response.Fail(c, http.StatusBadRequest, 1001, "暂不支持该平台")
		return
	}
	account := models.Account{
		WorkspaceID:   c.GetUint64("wsid"),
		Platform:      req.Platform,
		Remark:        req.Remark,
		AgentDeviceID: req.AgentDeviceID,
		Status:        "unbound",
		Health:        100,
	}
	if err := h.DB.Create(&account).Error; err != nil {
		response.Fail(c, http.StatusInternalServerError, 5000, "创建失败")
		return
	}
	response.Audit(c, "account.create", "account:"+itoa(account.ID), gin.H{"platform": req.Platform, "remark": req.Remark})
	response.OK(c, account)
}

// Update 修改账号资料（名称/头像/IP画像）
func (h *AccountHandler) Update(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		response.Fail(c, http.StatusBadRequest, 1001, "参数不合法")
		return
	}
	var req accountReq
	if err = c.ShouldBindJSON(&req); err != nil {
		response.Fail(c, http.StatusBadRequest, 1001, "参数不合法")
		return
	}
	updates := map[string]interface{}{"remark": req.Remark}
	if req.AccountName != "" {
		updates["account_name"] = req.AccountName
	}
	if req.AgentDeviceID > 0 {
		updates["agent_device_id"] = req.AgentDeviceID
	}
	if err = h.DB.Model(&models.Account{}).Where("id = ? and workspace_id = ?", id, c.GetUint64("wsid")).Updates(updates).Error; err != nil {
		response.Fail(c, http.StatusInternalServerError, 5000, "更新失败")
		return
	}
	response.Audit(c, "account.update", "account:"+itoa(id), gin.H{"remark": req.Remark})
	response.OK(c, nil)
}

// Delete 删除账号（仅未绑定）
func (h *AccountHandler) Delete(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		response.Fail(c, http.StatusBadRequest, 1001, "参数不合法")
		return
	}
	var account models.Account
	if err = h.DB.Where("id = ? and workspace_id = ?", id, c.GetUint64("wsid")).First(&account).Error; err != nil {
		response.Fail(c, http.StatusNotFound, 1004, "账号不存在")
		return
	}
	if account.Status == "active" || account.Status == "binding" {
		response.Fail(c, http.StatusConflict, 3001, "已绑定或绑定中的账号不可删除")
		return
	}
	if err = h.DB.Delete(&account).Error; err != nil {
		response.Fail(c, http.StatusInternalServerError, 5000, "删除失败")
		return
	}
	response.Audit(c, "account.delete", "account:"+itoa(id), nil)
	response.OK(c, nil)
}

// Bind 发起绑定：创建挑战记录（pending），等待客户端扫码（D4 WSS 联动）
func (h *AccountHandler) Bind(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		response.Fail(c, http.StatusBadRequest, 1001, "参数不合法")
		return
	}
	var account models.Account
	if err = h.DB.Where("id = ? and workspace_id = ?", id, c.GetUint64("wsid")).First(&account).Error; err != nil {
		response.Fail(c, http.StatusNotFound, 1004, "账号不存在")
		return
	}
	if account.Status == "active" {
		response.Fail(c, http.StatusConflict, 3002, "账号已绑定")
		return
	}
	challenge := models.Challenge{
		WorkspaceID: c.GetUint64("wsid"),
		AccountID:   account.ID,
		Platform:    account.Platform,
		Kind:        "pending",
		Status:      "active",
		Prompt:      "等待客户端发起扫码，稍后此处展示二维码",
		ExpiresAt:   time.Now().Add(30 * time.Minute),
	}
	err = h.DB.Transaction(func(tx *gorm.DB) error {
		if err = tx.Create(&challenge).Error; err != nil {
			return err
		}
		return tx.Model(&account).Update("status", "binding").Error
	})
	if err != nil {
		response.Fail(c, http.StatusInternalServerError, 5000, "发起绑定失败")
		return
	}
	// 定向下发：优先账号指定设备，否则工作空间首个在线设备
	if h.Hub != nil {
		target := account.AgentDeviceID
		if target == 0 || !h.Hub.AgentOnline(target) {
			if online := h.Hub.OnlineDevices(c.GetUint64("wsid")); len(online) > 0 {
				target = online[0]
			}
		}
		if target != 0 {
			env := proto.NewEnvelope(uuid.NewString(), proto.TypeChallenge, proto.Challenge{
				ChallengeID: strconv.FormatUint(challenge.ID, 10),
				AccountID:   strconv.FormatUint(account.ID, 10),
				Platform:    account.Platform,
				Kind:        "qr",
				Prompt:      "请使用手机客户端扫码登录 " + account.Platform,
				ExpiresAt:   challenge.ExpiresAt.UnixMilli(),
			})
			_ = h.Hub.SendToAgent(target, env)
		}
	}
	response.Audit(c, "account.bind", "account:"+itoa(account.ID), gin.H{"challengeId": challenge.ID})
	response.OK(c, gin.H{"challengeId": challenge.ID, "account": account.ID, "status": "binding"})
}